Across
2. A star that has left the main sequence and is burning helium red giant
8. Cool stars appear this colour red
9. A red supergiant star in the constellation of Orion Betelgeuse
10. The term for a graph on which the luminosity of stars is plotted against temperature Hertzsprung Russell (no space or hyphen in crossword)
13. The temperature of a star depends on its age and its….mass
17. The brightness of a star magnitude
18. sequence A star that is ‘burning’ hydrogen lies on the…main sequence
19. The magnitude of a star as it appears in the night sky apparent
22. The element stars fuse when they become red giants helium
24. A unit of interstellar distance, the distance light travels in one year light year (no space in crossword)
26. Stars don’t really burn, they get their energy from nuclear….fusion
27. Very large stars can collapse into one of these after a supernova black hole
28. The element stars ‘burn’ when they lie on the main sequence hydrogen
29. A star that does not get hot enough to start hydrogen fusion is called a brown dwarf…
30. A star that has finished nuclear fusion and is radiating away gravitational energy white dwarf Down
1. A white dwarf will fade away and become a…black dwarf
2. Burning stars are prevented from collapsing by radiation pressure
3. A dense cloud of gas that is about to ignite to become a star protostar
4. A unit of interstellar distance, about 3.3 light years parsec
5. The amount of light given off by a star, compared to the Sun luminosity
6. The ‘colour’ of G type stars like our Sun yellow
7. A star made of degenerate mater after protons and electrons have combined Neutron star
11. The colour of a star is an indication of its….temperature
12. Gas clouds collapse to form stars because of…gravity
14. An exploding star supernova
15. The approximate distance to Sirius in light years eight
16. The force that hold protons and electrons apart in stellar cores is called electrondegeneracy pressure 20. The magnitude a star would appear to be if it were 32 light years away absolute
21. A Red Giant star can throw off a cloud of gas which becomes a planetary…nebula
23. The interstellar gas from which stars form is called a…molecular cloud
25. The element that is formed at the core of heavy stars iron
27. Very hot stars can be this colour blue
Across
2. A star that has left the main sequence and is burning helium red giant
8. Cool stars appear this colour red
9. A red supergiant star in the constellation of Orion Betelgeuse
10. The term for a graph on which the luminosity of stars is plotted against temperature Hertzsprung Russell (no space or hyphen in crossword)
13. The temperature of a star depends on its age and its….mass
17. The brightness of a star magnitude
18. sequence A star that is ‘burning’ hydrogen lies on the…main sequence
19. The magnitude of a star as it appears in the night sky apparent
22. The element stars fuse when they become red giants helium
24. A unit of interstellar distance, the distance light travels in one year light year (no space in crossword)
26. Stars don’t really burn, they get their energy from nuclear….fusion
27. Very large stars can collapse into one of these after a supernova black hole
28. The element stars ‘burn’ when they lie on the main sequence hydrogen
29. A star that does not get hot enough to start hydrogen fusion is called a brown dwarf…
30. A star that has finished nuclear fusion and is radiating away gravitational energy white dwarf
Down
1. A white dwarf will fade away and become a…black dwarf
2. Burning stars are prevented from collapsing by radiation pressure
3. A dense cloud of gas that is about to ignite to become a star protostar
4. A unit of interstellar distance, about 3.3 light years parsec
5. The amount of light given off by a star, compared to the Sun luminosity
6. The ‘colour’ of G type stars like our Sun yellow
7. A star made of degenerate mater after protons and electrons have combined Neutron star
11. The colour of a star is an indication of its….temperature
12. Gas clouds collapse to form stars because of…gravity
14. An exploding star supernova
15. The approximate distance to Sirius in light years eight
16. The force that hold protons and electrons apart in stellar cores is called electron degeneracy pressure
20. The magnitude a star would appear to be if it were 32 light years away absolute
21. A Red Giant star can throw off a cloud of gas which becomes a planetary…nebula
23. The interstellar gas from which stars form is called a…molecular cloud
25. The element that is formed at the core of heavy stars iron
27. Very hot stars can be this colour blue